package com.sky.aspect;
//自定义切面类

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import sun.util.resources.LocaleData;

import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.util.Locale;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}
    //前置通知 ，在通知中进行赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充");

        //获取当前拦截方法上的数据库操作类型
         MethodSignature  signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型
        //获取当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        long currentld = BaseContext.getCurrentId();
        //根据当前不同操作类型为对应属性通过反射赋值
        if (operationType == OperationType.INSERT){
            //为四个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdataTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdataUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象赋值
                setUpdataTime.invoke(entity,now);
                setUpdataUser.invoke(entity,currentld);
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentld);
            } catch (Exception e) {
               e.printStackTrace();
            }
        }else if (operationType == OperationType.UPDATE){
            //为两个公共字段赋值

            try {
                Method setUpdataTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdataUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象赋值
                setUpdataTime.invoke(entity,now);
                setUpdataUser.invoke(entity,currentld);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
}
